JPH03185598A - Fire sensor for sprinkler extinguishing equipment - Google Patents

Abstract

PURPOSE:To attain sure operation by means of simple configuration by providing a fire sensor with a holding mechanism for holding a head cover on a protecting position at a normal state and releasing the holding state by the temperature of an alarm state and a release detector for detecting the releasing operation of the head cover. CONSTITUTION:When a fire is generated and the firing temperature arrives at the alarm state temperature, the holding mechanism H executes release operation, the head cover 8 is unlocked, the release detector R detects the releasing operation of the head cover 8 and outputs the alarm state of an alarm district. Since the head cover 8 held by the holding mechanism H is arranged on a position covering the head part 4 of a sprinkler head 1, the cover 8 is arranged almost on the same position as the sprinkler head 1 against a fire point and a trouble disabling the fire sensor due to the positional shear between the head cover 8 and the sprinkler head 1 can be removed. Thus, the reliability of operation can be improved by the simple mechanism.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a fire detector for a pre-acting sprinkler fire extinguishing system.

(Conventional technology) Computer rooms, archives, museums, etc. in buildings that do not want water damage, etc.
Closed type sprinklers at terminals in semiconductor factories and residential units
Wet sprinklers that are constantly filled with pressurized water up to the head - pre-acting sprinklers instead of head fire extinguishing equipment
Fire extinguishing equipment is preferred.

This pre-activation sprinkler fire extinguishing system is equipped with a closed sprinkler head and a fire detector in each warning area, and when the fire detector operates, an on-off control valve is opened to discharge water, etc. to all sprinkler heads. It is filled with water and discharges the fire extinguishing water from the sprinkler head which is opened at the location of the fire.

Therefore, the fire detector and the sprinkler head mutually confirm the presence of a fire and release the extinguishing water, allowing stable operation as a fire extinguishing equipment.

(Problem to be solved by the invention) In such conventional equipment, fire detectors and sprinklers
Fire detectors are arranged separately from sprinkler heads, and generally one fire detector is provided for each sprinkler head.

For this reason, if the point of fire is close to the sprinkler head but a little far from the fire detector, the fire detector's operation may be delayed, and as a result, the initial fire extinguishing purpose may not be achieved. be.

Further, dust tends to adhere to the exposed tip of the sprinkler head, and there is a risk of accidental collision with objects.

This invention was proposed in order to solve the problems of conventional sprinkler fire extinguishing equipment and its fire detector, and it is an object of the present invention to propose a fire detector for sprinkler fire extinguishing equipment that has a simple configuration and reliable operation. It is an object.

(Means for Solving the Problems) The configuration of the present invention for solving the above problems includes a head cover 8 that can protect the tip portion 4 of the closed type sprinkler head 1 and has high heat conductivity, and a Rad cover 8
The head cover 8 has a holding mechanism H configured to hold the head cover 8 in the protected position and release the holding state depending on the temperature of the alert state, and a release detector R that detects the release operation of the head cover 8.

The holding mechanism H is configured to be able to operate reversibly at the respective temperatures in the normal state and in the alert state.

Further, the present invention provides the tip portion 4 of the sprinkler head l.
A spring 27 having high heat conductivity is interposed between the head cover 8 and the head cover 8 to assist in the releasing operation of the head cover 8.

(Function) When a fire occurs and the temperature reaches the alarm state, the holding mechanism H
is released and the head cover 8 comes off, and the release detector R detects this release action of the head cover 8 and operates, outputting that the warning area has entered the warning state.

The output of the release detector R is used in the same way as a conventional fire detector to fill up the sprinkler head 1 with water or other fire extinguishing water.

The head cover 8 held by the holding mechanism H has the same function as a conventional fire detector as described above, and since it is provided in a position to cover the tip 4 of the sprinkler head 1, On the other hand, it is located almost in the same position as the sprinkler hend 1, and the problem of the fire detector not working due to mutual positional deviation, which was the case in the past, has been solved.

At the same time, the tip portion 4 of the sprinkler head 1 is protected by the head cover 8 from adhesion of dust and collision with foreign objects.

The holding mechanism H of the head cover 8 reversibly performs holding and releasing operations at the respective temperatures in the normal state and the alert state, and is therefore particularly convenient for testing.

Tip part 4 of sprinkler hend 1 and head cover 8
By means of a highly heat-conductive spring 27 interposed between the head cover 8 and the head cover 8, heat from the ignition point is efficiently transmitted to the tip portion 4, and the head cover 8 is reliably removed when a state of alarm occurs.

(Example) Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a partially longitudinal front view of the sprinkler head 1, and FIG. 5 is an overall view of the sprinkler fire extinguishing equipment.

The base of the sprinkler head 1 is attached to the supply pipe 5 so that the tip 4 of the closed type sprinkler head 1 can be seen through a cutout hole 3 formed in the ceiling plate 2 of the guarded area.

A cylindrical frame 7 with an opening 6 at the lower end is attached to the base of the sprinkler head 1, the ceiling plate 2, or the supply pipe 5, so that the frame 7 surrounds the outer periphery of the sprinkler head 1, The head cover 8 illustrated in FIG. 4, which is capable of closing the opening 6 and has high heat conductivity, is held to the frame body 7 by a holding mechanism H in a normal state, and this holding state is released by the temperature in a warning state. Holding mechanism H
is configured.

The holding mechanism H illustrated in FIG. 1 is composed of a locking part lO made of a shape memory alloy fixed to the back surface of the head cover 8, and the locking part 10 is in the state shown in FIG. It maintains a shape that can be locked into the opening 6 of the frame 7, and when the temperature reaches the alert state, it deforms into a shape that comes off from the opening 6 as shown by the solid line in FIG. It is carried out reversibly at each of the above temperatures.

An electric opening/closing control valve 12 is provided with a release detector R that detects when the head cover 8 comes off the opening 6 and is released, and prevents the supply of extinguishing water such as water to the supply pipe 5.
and the release detector R in a control circuit 13 as a control means C.
are connected by arrangement 14 via.

The illustrated release detector R uses a microswitch 15, and its actuator 16 is brought into contact with the back surface of the head cover 8 in the holding position. Open the bottom.

The opening operation of the sprinkler head 1 is detected by the discharge of fire extinguishing water from the sprinkler head 1 or the operation of the defragment 40 that projects and hangs from the sprinkler head 1.

That is, a discharge detection means M for detecting an opening operation of the sprinkler head 1 is provided, and an alarm means 18 for warning the detection operation and the discharge detection means M are connected by a wiring 19 via a control circuit 13.

The exemplified release detection means M includes a thin plate 21 that is fitted into a plurality of seats 20 provided on the frame body 7 and that can be dissolved by extinguishing water.
It is composed of a microswitch 23 which closes a contact by bringing an actuator 22 into contact with the back surface of the thin plate 21 in the fitting position and by the protruding operation of the actuator 22 as the thin plate 21 melts and ignites.

The thin plate 21 has an edge 2 for fitting into the seat 20 of the frame body 7, as shown in a plan view in FIG. 8 and in a front view in FIG.
4, a large number of ventilation holes 25 for passing hot air, and a hole 26 for inserting the actuator 16 of the microswitch 15.
and a hole 28 through which a metal spring 27 interposed between the tip portion 4 of the sprinkler head 1 and the head cover 8 is inserted.

The illustrated control circuit 13 doubles as a fire receiver, uses a battery 29 as a power source, and a relay 30 is activated by the fire signal outputted by the detection operation of the release detector R, and its normally open contacts 31 and 38 are activated. is closed, thereby operating the electric part 32 (motor or solenoid) of the on-off control valve 12 to the open position, as well as sounding the sound device 39 such as the main bell or district bell and lighting the fire area indicator light 41. The relay 33 is actuated by the detection operation caused by the protrusion of the actuator 22 of the microswitch 23 of the discharge detection means M, and its normally open contact 34 is closed. It is configured to activate alarm lights and alarm lamps.

Next, the operation of the above embodiment will be explained.

When a fire occurs, the heat is transferred to the end portion 4 of the sprinkler head 1 via the head cover 8 and the locking portion 10 and the heat-conductive spring 27, respectively.

When the temperature reaches the alert state, the locking part 10 deforms due to the characteristics of the shape memory alloy and comes off from the opening 6 of the frame 7, and the holding mechanism H releases the holding state, and due to its own weight and the spring 27. Due to the restoring force, the head cover 8 falls as shown in FIG.

Micro switch 15 supported by head cover 8
The actuator 16 protrudes, the release detector R performs a detection operation, the relay 30 operates to close the normally open contact 31, the electric part 32 operates, the on/off control valve 12 opens, and the fire extinguishing water is supplied. It flows into the pipe 5 and fills the sprinkler with Rad 1.

At the same time, the normally open contact 38 closes, causing the sound device 39 to sound and the fire area indicator light 41 to light up to notify that a fire has occurred.

The heat from the fire point is transferred through the thin plate 21 and the holes 25, 26, 28 to the tip part 4 of the sprinkler head 1, and at a predetermined temperature the fusible alloy of the sprinkler head 1 melts and opens, extinguishing the fire. Medicinal water is released.

The thin plate 21 melted and fell due to the extinguishing water that was released.
The actuator 22 supported by the thin plate 21 protrudes, causing the microswitch 23 to operate (FIG. 3), and the relay 33 operates to close the normally open contact 34, thereby causing the alarm means 18 to close.
is activated and a predetermined alarm is issued.

The head cover 8 held by the holding mechanism H in this way plays a role such as detecting that the temperature has reached the alert state and notifying the control means C of this detection operation to open the opening/closing control valve 12. It has a function as a fire detector, and is located in a position that covers the tip 4 of the sprinkler head 1, that is, in a position concentric with the heat-sensitive part of the sprinkler head 1, so that the sprinkler does not touch the point of fire. - The position is almost the same as that of the heat sensitive part of the sprinkler head, which solves the problem of the fire detector not working due to the misalignment of the fire detector and the heat-sensitive part of the sprinkler head. Another advantage is that the heater 1 and the fire detector are integrated into a unit.

The head cover 8 protects the tip 4 of the sprinkler head 4 from adhesion of dust and the collision of foreign objects, and the tip 4 and the opening 3 of the ceiling plate 2 are covered by the head cover 1, which improves the appearance. Both points are good.

In this embodiment, since the locking part 10 as the holding mechanism H is formed of a shape memory alloy, the locking part 10 that is deformed to the disengaged position at the temperature of the alert state returns to room temperature and locks in the opening 6. This allows the head cover 8 to be reused, making it especially convenient for testing after installation.

Although not shown in the drawings, this locking portion 10 can function as the holding mechanism H even if a fuse metal that melts at a warning temperature is used.

Since the illustrated example microswitch 23 is used as the release detector R that detects when the head cover 8 in the holding state comes off at the alarm temperature, no current flows through the release detector R under normal conditions. This is advantageous in terms of power saving, and a battery can be used as a power source, and if a battery is used, the control circuit 13 can be miniaturized.

The release detection means M, which can directly detect the release of fire extinguishing water from the sprinkler head 1, indicates that the sprinkler head 1 has opened and the discharge of fire extinguishing water such as water has started. The detection operation is performed reliably without mistakes.

That is, the flowing water during filling by opening the on-off control valve 12 in the alert state has no effect on the discharge detection means M at all, and furthermore, the pollution and water scale of the related piping does not affect the discharge detection means M of the above configuration.
There is no risk of malfunction due to water hammer or water pressure fluctuations in related piping.

Furthermore, the sprinkler head l, the head cover 8 as a fire detector, the holding mechanism H, and the discharge detection means M
Since it can be made into a unit, it is extremely convenient for installation work and electrical wiring.

Next, a sprinkler rod 1 using another embodiment of the holding mechanism H is shown in the normal state in FIG. 6 and in the alert state in FIG. 7, respectively.

Regarding the same components as those of the first embodiment shown in FIG. 1,
In each of these figures, the same reference numerals are given and the explanation of the structure is omitted.

The holding mechanism H includes a temperature-sensitive ferrite 35 attached to the back of the head cover 8 and a permanent magnet 36 attached to the lower part of the frame 7.
Under normal conditions, the temperature-sensitive ferrite 35 is attracted to the permanent magnet 36 and is connected to the sprinkler as shown in FIG.
A head cover 8 is placed in a position to protect the tip portion 4 of the head l.
However, when the temperature reaches the alarm state, the magnetic polarity of the temperature-sensitive ferrite 35 changes and the magnetic force to attract the permanent magnet 36 is lost.

The release detector R in the embodiment shown in FIG. 6 uses a reed switch 37, and in the adsorption state, its contact is opened due to the magnetic properties of the temperature-sensitive ferrite 35, and as shown in FIG. When the reed switch 35 is separated, the permanent magnet 36 closes and opens the contacts of the reed switch 37.

Therefore, under normal conditions, the temperature-sensitive ferrite 35 is attached to the permanent magnet 36.
is attracted, the head cover 8 protects the tip portion 4, and the reed switch 37 is open.

Temperature-sensitive ferrite 35 was damaged through the head cover 8 due to a fire.
When the temperature reaches the alarm state, the adhesion force to the permanent magnet 36 is lost, the head cover 8 falls, and the reed switch 37
is closed, the relay 30 and the electric part 32 are operated, and the on-off control valve 12 is opened.

In the invention of this second embodiment, similarly to the first embodiment shown in FIG. 1, the head cover 8 held by the holding mechanism H is
As mentioned above, it can function as both an accurately operating fire detector and a protective cover.

Also, like the holding mechanism H in FIG. 1, the holding mechanism H of this second embodiment has reversibility at each temperature in the normal state and the alert state, and the head cover 8 can be reused. possible and convenient for testing.

The release detection means M for detecting the release of fire extinguishing water from the sprinkler rad 1 has a structure for detecting when the water-soluble thin plate 21 dissolves in water and catches fire, as well as a frame (not shown). Any one member such as a band-shaped body, a ring-shaped plate with a wire stretched through a hole in the center, or a disc-shaped body with a notch in the center is fitted into the seat 20 of the frame body 7. The actuator 22 of the microswitch 23 is placed on this fitted member, and the member is moved to the seat 2 by the protruding movement of the deflector 40 accompanying the opening of the sprinkler head 1 or by the discharge pressure of fire extinguishing water.
The discharge detecting means M may have a structure in which the microswitch 23 is operated by the protrusion of the actuator 22 when the actuator 22 deviates from 0.

Further, a light emitting element and a light receiving element are disposed opposite to each other below the tip portion 4 of the sprinkler head 1, and a release detection means M is provided which operates by blocking the light reception of the light receiving element by the ejected extinguishing water. May be used.

No matter which of these discharge detection stages M is used, like the discharge detection means M of the first embodiment, it will not malfunction due to water filling in the sprinkler head 1 or fluctuations in water pressure in the supply pipe 5.
There is no risk of malfunction due to contamination of related piping.

Further, the spring 27 with high heat conductivity provided between the tip portion 4 of the sprinkler head 1, that is, the heat-sensitive portion and the head cover 8, may be made of other shapes such as a curved plate spring. good.

(Effects of the Invention) As described above, according to the present invention, the head cover 8 held by the holding mechanism H comes off when the temperature reaches the alert state, and has the same function as a conventional fire detector. ,
Since it is located in a position that covers the tip 4 of the sprinkler head 1, it is almost at the same position as the sprinkler head 1 with respect to the fire point, and the problem of the fire detector not working due to mutual positional deviation as in the past is avoided. This problem has been solved, and it is now possible to combine the sprinkler head 1 and the fire detector into a unit.

The head cover 8 also protects the tip portion 4 of the sprinkler head 1 from collisions with dust and foreign objects, thereby improving its appearance.

Since the holding mechanism H of the head cover 8 reversibly performs holding and releasing operations at each temperature in the normal state and the alert state, the head cover 8 and the holding mechanism H can be reused, which is particularly convenient for testing after installation. It became.

Sprinkler head 1 tip 4 and head cover 8
The heat-conductive spring 27 interposed between the
This has the advantage that preparation for the opening operation can be carried out without any trouble, and the operation for removing the head cover 8 can be carried out reliably in the alert state.

[Brief explanation of drawings]

Each figure shows an embodiment of the present invention, and FIGS. 1 and 6 are partial vertical front views of the sprinkler head in the normal state in each embodiment, and FIGS. 2 and 3 are implementations of the embodiment of FIG. FIG. 4 is a plan view of the head cover, and FIG. 5 is a partial front view of the sprinkler shown in FIG.
A block diagram of a fire extinguishing equipment using a head, Fig. 7 is a partially longitudinal front view of the embodiment shown in Fig. 6 in an operating state, Fig. 8 is a plan view of the discharge detection means, and Fig. 9 is a front view of Fig. 8. It is a diagram. l... Sprinkler 2... Ceiling plate 3... Cutout hole 4... Tip part 5... Supply piping
6... Opening 7... Frame 8...
Head cover 10... Locking part 12... Opening/closing control valve 13... Control circuit 14.19... Wiring 15.23... Micro switch 16.22... Operator 18... Alarm means 20・
... Seat 21 ... Thin plate 24 ... Edge
25... Ventilation hole 26.28... Hole
27... Spring 29... Battery 30.33.
・Relay 31.34.38・・Normally open contact

Claims (3)

[Claims] (1) A head cover that can protect the tip of a closed sprinkler head and has excellent heat conductivity, and a structure that maintains the head cover in the protected position in normal conditions and releases the holding state depending on the temperature in the alert state. A fire detector for sprinkler fire extinguishing equipment, comprising: a mechanism; and a release detector that detects the release operation of the head cover. (2) The fire detector for sprinkler fire extinguishing equipment according to claim 1, wherein the holding mechanism is capable of operating reversibly at each temperature in the normal state and in the alert state. (3) Claim 1 characterized in that a spring with high heat conductivity is interposed between the tip portion of the sprinkler head and the head cover to assist the releasing operation of the head cover.
Fire detector of sprinkler fire extinguishing equipment described.